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Interference Powder is written by Jean Hanff Korelitz and published by Marshall Cavendish. It's available with International Standard Book Number or ISBN identification 0761452753 (ISBN 10) and 9780761452751 (ISBN 13).
Fifth-grader Nina Zabin happens upon a strange powder that causes events in her life to change, and not always for the better, as the school's Brain Buster Extravaganza approaches and she takes her best friend's place as representative for their class.